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This crack will allow sandbox player, completely alone.
What you can't do:
You can't play against other players.
What you can do:
Build up your units, move around, play as if you loaded up a map by yourself.

All the credit for the crack goes out to Teknogods and their SC2 crack team
'LazyTown'.

From the AV_NOTICE.txt packed with the file:
The launcher has been VMProtected to prevent Blizzard from easily patching this, and
may throw a false positive for some antivirus and malware scanners.
This file is 100% CLEAN.
--LazyTown

Install SC2 beta.
Update SC2 beta (via blizzard, can do this without login)
Run loader (FROM ANY LOCATION)
Choose map (FROM ANY LOCATION)
Enjoy SC2 sandbox style. You can edit your settings and all that business once you
start it up, just choose resume game.